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the nastier the comments, the more polarized readers became about the contents of the article, a phenomenon they dubbed the “nasty effect.” But the nasty effect isn’t new, or unique to the Internet. Psychologists have long worried about the difference between face-to-face communication and more removed ways of talking—the letter, the telegraph, the phone. Without the traditional trappings of personal communication, like non-verbal cues, context, and tone, comments can become overly impersonal...
— newyorker.com